I was dancing with my daughter, trying to keep her entertained in our Downtown apartment and suddenly we heard a big BOOM out towards Campus Martius. Looking out the window, I can see a huge grey cloud that appears to be dissipating. Anyone know what that was? My first thought was Lafayette Building Demo, but it is kind of late for them to be working on that, isn't it? DetroitMom thought maybe it was a movie shoot again, because of all the trailers in the area.